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Mirrors > Home > MPE Home > Th. List > 9t11e99 | Structured version Visualization version GIF version |
Description: 9 times 11 equals 99. (Contributed by AV, 14-Jun-2021.) (Revised by AV, 6-Sep-2021.) |
Ref | Expression |
---|---|
9t11e99 | ⊢ (9 · ;11) = ;99 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 9cn 11725 | . . . 4 ⊢ 9 ∈ ℂ | |
2 | 10nn0 12104 | . . . . . 6 ⊢ ;10 ∈ ℕ0 | |
3 | 2 | nn0cni 11897 | . . . . 5 ⊢ ;10 ∈ ℂ |
4 | ax-1cn 10583 | . . . . 5 ⊢ 1 ∈ ℂ | |
5 | 3, 4 | mulcli 10636 | . . . 4 ⊢ (;10 · 1) ∈ ℂ |
6 | 1, 5, 4 | adddii 10641 | . . 3 ⊢ (9 · ((;10 · 1) + 1)) = ((9 · (;10 · 1)) + (9 · 1)) |
7 | 3 | mulid1i 10633 | . . . . . 6 ⊢ (;10 · 1) = ;10 |
8 | 7 | oveq2i 7156 | . . . . 5 ⊢ (9 · (;10 · 1)) = (9 · ;10) |
9 | 1, 3 | mulcomi 10637 | . . . . 5 ⊢ (9 · ;10) = (;10 · 9) |
10 | 8, 9 | eqtri 2841 | . . . 4 ⊢ (9 · (;10 · 1)) = (;10 · 9) |
11 | 1 | mulid1i 10633 | . . . 4 ⊢ (9 · 1) = 9 |
12 | 10, 11 | oveq12i 7157 | . . 3 ⊢ ((9 · (;10 · 1)) + (9 · 1)) = ((;10 · 9) + 9) |
13 | 6, 12 | eqtri 2841 | . 2 ⊢ (9 · ((;10 · 1) + 1)) = ((;10 · 9) + 9) |
14 | dfdec10 12089 | . . 3 ⊢ ;11 = ((;10 · 1) + 1) | |
15 | 14 | oveq2i 7156 | . 2 ⊢ (9 · ;11) = (9 · ((;10 · 1) + 1)) |
16 | dfdec10 12089 | . 2 ⊢ ;99 = ((;10 · 9) + 9) | |
17 | 13, 15, 16 | 3eqtr4i 2851 | 1 ⊢ (9 · ;11) = ;99 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1528 (class class class)co 7145 0cc0 10525 1c1 10526 + caddc 10528 · cmul 10530 9c9 11687 ;cdc 12086 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-sep 5194 ax-nul 5201 ax-pow 5257 ax-pr 5320 ax-un 7450 ax-resscn 10582 ax-1cn 10583 ax-icn 10584 ax-addcl 10585 ax-addrcl 10586 ax-mulcl 10587 ax-mulrcl 10588 ax-mulcom 10589 ax-addass 10590 ax-mulass 10591 ax-distr 10592 ax-i2m1 10593 ax-1ne0 10594 ax-1rid 10595 ax-rnegex 10596 ax-rrecex 10597 ax-cnre 10598 ax-pre-lttri 10599 ax-pre-lttrn 10600 ax-pre-ltadd 10601 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3or 1080 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-ne 3014 df-nel 3121 df-ral 3140 df-rex 3141 df-reu 3142 df-rab 3144 df-v 3494 df-sbc 3770 df-csb 3881 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-pss 3951 df-nul 4289 df-if 4464 df-pw 4537 df-sn 4558 df-pr 4560 df-tp 4562 df-op 4564 df-uni 4831 df-iun 4912 df-br 5058 df-opab 5120 df-mpt 5138 df-tr 5164 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-ov 7148 df-om 7570 df-wrecs 7936 df-recs 7997 df-rdg 8035 df-er 8278 df-en 8498 df-dom 8499 df-sdom 8500 df-pnf 10665 df-mnf 10666 df-ltxr 10668 df-nn 11627 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-dec 12087 |
This theorem is referenced by: 3dvds2dec 15670 1259lem3 16454 |
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